Japanese women are the best of the Asian's. 
Hard to decide.  When I went to Tokyo I saw some crazy hot chicks.  Some totally stunners.  But they all acted real fucked up.  In Thailand though I saw a ton of hot chicks.  They all had perfect fucking skin.  And were very sensual.  Singapore women are hot as well. I think the worst are cambodians.
Vietnamese are pretty awful, but this joint I go to often to get my feet scrubbed had this one import.  She was gorgeous.  When I went back the next week to see if I can chat her up, they said she left to another place and wouldn't tell me where.  I was pissed.